640 IR FTIR

The Varian 640 IR is a benchtop spectrometer manufactured by Varian, Inc. The instrument uses a 38 mm dynamically aligned, 60° mechanical bearing Michelson interferometer. The Varian 640 IR is available in mid-IR and near-IR configurations. The standard mid-IR range is 7,900 to 375 cm⁻¹ and the standard near-IR range is 11,000 to 2,000 cm⁻¹. The instrument achieves an unapodized optical resolution of less than 0.18 cm⁻¹. The spectrometer enclosure is sealed and desiccated, with a tropical (moisture-resistant) option available. The Varian 640 IR uses a 24-bit delta-sigma A/D converter and communicates via USB 2. The instrument weighs 80 kg (176 pounds) and measures 70.8 x 75.6 x 34.4 cm (27.9 x 29.8 x 13.5 in).^[3][1][2]

The Varian 640 IR uses a 38 mm dynamically aligned, 60° mechanical bearing Michelson interferometer. The interferometer design provides stability and reproducibility. The instrument includes an air-cooled ceramic source for mid-IR and a tungsten-halogen source for near-IR. The standard detector is a cooled DLaTGS for mid-IR and a PbSe detector for near-IR. The interferometer is dynamically aligned to maintain optical alignment over time.^[1]

The Varian 640 IR is suited to QA/QC applications, identification and verification analyses, and is an ideal educational tool. The instrument is compatible with a wide range of accessories, including single-point microscopy, microscopy imaging, macro imaging, patented ATR imaging, and hyphenated techniques such as thermogravimetric analysis (TGA-IR).^[1]